Abstract:
Solar cell has been widely used to generate electricity in recent years. However, it has some disadvantages, e.g. the generated power, voltage magnitude and frequency are intermittent due to the variation of irradiance and ambient temperature. Injection of such power into the utility grid affects the quality of electricity and system stability, in particular. Installing appropriate size of battery to the generation system could alleviate these difficulties. An optimal battery capacity could enable the total generation to meet the load demand, decrease fluctuation, and can limit total investment costs. The purpose of this thesis is to determine the appropriate capacity of battery for the fluctuated power and frequency elimination. Firstly, irradiance and ambient temperature are simulated by a mathematical model considering uncertainty of these factors, including the correlation between them. Then the power output, voltage, and frequency can be computed based on Grid connected Photovoltaic System. To determine an optimal battery capacity, the mathematical model of lead-acid battery is applied altogether with a numerical method. The batterys capacity will be chosen from actual manufacturers data. This proposed algorithm has tested, and satisfactory results have been obtained.